It has been announced that bassist John McVie of the rock group FLEETWOOD MAC is battling an unspecified form of cancer, and that his treatment will force the group to cancel their upcoming tour plans.

The band was slated to begin a 14-date tour of Australia and New Zealand on Nov. 10 in Sydney.

McVie, who is the longest-tenured member of the group after drummer Mick Fleetwood, is now scheduled to be in treatment for cancer during that period of time.

FLEETWOOD MAC announced the news on their official Facebook page. The statement reads as follows:

“We are sorry to not be able to play these Australian and New Zealand dates. We hope our Australian and New Zealand fans as well as FLEETWOOD MAC fans everywhere will join us in wishing John and his family all the best.”